Petro Poroshenko

The Ukrainian comic-turned-president is back in the spotlight amid row over phone call with Donald Trump

Trump threatens to cancel G20 meeting with Putin over ‘aggressive’ behaviour

Tensions with Russia escalate as world powers urge both sides back from the brink

At least six Ukrainian sailors have been injured as tensions between Kiev and Moscow flare

Lawyer was allegedly paid $400,000 to set up meeting between Donald Trump and Ukraine’s president

US president and German Chancellor threaten Russia with more sanctions over Ukraine

Incursion could violate the peace treaty as Ukrainian troops prepare for combat operations in the east

Presidents Putin and Poroshenko agree to steps towards a truce as US and EU sanctions bite in Russia

Analysts say Russia may be trying to establish a land corridor through Ukraine to Crimea

Putin and Poroshenko agree to work together, but Russia says it's up to Kiev to end the fighting

Analysts believe the Russian president may be looking for a way to save face by withdrawing support for pro-Russian separatists

Ukraine forces and pro-Russian rebels blame each other for attack outside eastern city of Luhansk